Cutting by use of rotating axially moving tool – Tool having crystalline cutting edge
Patent
1990-04-26
1993-01-12
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool having crystalline cutting edge
51206R, 428 59, B23B 5102
Patent
active
051784971
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electrodeposited reamer tool for use in precision processing of bores.
BACKGROUND ART
As a conventionally employed electrodeposited reamer, for example, a lapping reamer disclosed in Japanese Utility Model Laid-Open No. 53427/1985 (filed by Takezawa Seiki) is known.
As shown in FIG. 22, as for the aforementioned reamer A, a work processing portion C provided at an end portion of a reamer body (base metal) B is formed cylindrically over its entire length. The arrangement provided is such that abrasive grains D are electrodeposited on an external peripheral surface of this processing portion C, and an unillustrated pressing member sealed in the processing portion C is screwed in for expanding the diameter by means of a set bolt provided at an end portion so as to set its diameter, thereby obtaining surface accuracy by controlling the electrodeposited abrasive grain size. It should be noted that, in the drawing, reference character E denotes a slit formed in the work processing portion C.
With the above-described electrodeposited reamer tool A, however, since its portion where the processing abrasive grains are electrodeposited, i.e., the work processing portion C, has a cylindrical shape, as mentioned above, it is impossible to provide a large machining allowance for a pre-processing hole which is formed in a work.
In addition, with the above-described electrodeposited reamer tool A, since the surface roughness is adjusted by controlling the processing abrasive grain diameter, it is necessary to set to a small dimension the machining allowance of the pre-processing hole which is formed in the work, in conjunction with the improvement of the surface roughness.
Accordingly, in order to effect precision processing of bores by using the above-described electrodeposited reamer tool A, it is necessary to preprocess the work with pre-processing bores having dimensional accuracy and surface roughness that are close to targets. For this reason, there has been a drawback in that the process for preprocessing becomes very complicated.
In view of the above-described situation, it is an object of the present invention to provide an electrodeposited reamer tool which is capable of effecting precision processing of bores with high efficiency without requiring a complicated preprocessing step.
DISCLOSURE OF THE INVENTION
An electrodeposited reamer tool in accordance with the present invention is characterized by comprising: a finishing portion having a cylindrical outer peripheral surface; and a cutting portion provided on a distal end side of the finishing portion and having a tapered configuration, wherein abrasive grains are electrodeposited on the outer peripheral surfaces of the two processing portions, respectively.
In accordance with this arrangement, by inserting the electrodeposited reamer tool into a prepared hole provided in a work, the prepared hole is enlarged by the cutting portion and is concurrently finished to a desired bore diameter by the finishing portion.
Accordingly, in accordance with the above-described electrodeposited reamer tool, it becomes possible to provide a large machining allowance for the prepared hole, so that it becomes unnecessary to preprocess the prepared hole with precision, and the preprocessing step is hence extremely facilitated.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a conceptual overall side-elevational view illustrating a first embodiment of an electrodeposited reamer tool in accordance with the present invention;
FIG. 2 is a conceptual overall side-elevational view illustrating a second embodiment;
FIG. 3 is a cross-sectional side view of an essential portion of the electrodeposited reamer tool of the same;
FIG. 4 is diagram of an end face of an electrodeposited reamer tool illustrating a third embodiment;
FIG. 5 is a side-elevational view of an essential portion of the electrodeposited reamer tool of the same;
FIG. 6 is a cross-sectional side view of an essential portion illustrating a state in which abrasive g
REFERENCES:
patent: Re24769 (1960-01-01), Willingham
patent: 3510990 (1970-05-01), Steindler
patent: 4757645 (1988-07-01), Ozer et al.
K. Yegenoglu, et al., "Dornhonen-alternative Bohrungsbearbeitung", Werkstatt und Betrieb, vol. 20, No. 7, Jul. 1987., pp. 561-564.
Indistrual Diamond Review, vol. 47, No. 520, Mar. 1987, "Good Surface Finish With Electroplated CBN Wheels".
Ishikawa Tadayuki
Kitabayashi Hiroyuki
Kuroda Hiroyuki
Nakakoji Yoshihiko
Nobuhara Masaki
Howell Daniel W.
Kabushiki Kaisha Komatsu Seisakusho
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